Licensed | Bonded | Insured
Licensed | Bonded | Insured

Flashing is an essential component of any roofing system, as it helps prevent water from seeping into the roof structure and causing damage. Installing flashing on a metal roof is a straightforward process when done correctly. This comprehensive guide, backed by industry experts, will teach you how to install flashing on your metal roof with ease, ensuring a durable, watertight seal.

How to Install Flashing on Metal Roofs: Comprehensive Guide

Choosing the Right Flashing Material

Before you start installing flashing on your metal roof, it’s essential to choose the right flashing material. Metal flashing is the most common choice for metal roofs because it is durable, corrosion-resistant, and compatible with metal roof panels. When selecting metal flashing, consider the following options:

  1. Aluminum: Lightweight, corrosion-resistant, and easy to work with, aluminum flashing is an excellent option for metal roofs. However, it may not be the best choice for coastal areas due to its susceptibility to saltwater corrosion.
  2. Galvanized steel: This type of flashing is coated with a layer of zinc to protect it from rusting. It’s a popular choice because it’s affordable and resistant to weathering.
  3. Copper: Copper flashing is highly durable and long-lasting, but it’s also more expensive than other options. Copper flashing will develop a natural patina over time, which can be a desirable aesthetic for some homeowners.
  4. Stainless steel: Known for its strength and corrosion resistance, stainless steel flashing is ideal for harsh environments and long-term durability. However, it can be more challenging to work with and is often more expensive than other options.

Necessary Tools and Safety Gear

Before you begin the installation process, gather the necessary tools and safety gear. This will help ensure a smooth and safe installation process. Some of the essential tools and safety equipment include:

Safety First: Always prioritize safety when working on a roof. Ensure you have a sturdy ladder and use appropriate fall protection equipment, such as a safety harness or anchor points.

Installing Flashing on a Metal Roof: Step-by-Step Guide

With your tools, safety gear, and flashing materials ready, you can now begin installing the flashing on your metal roof. Follow these expert-backed steps for a secure and watertight flashing installation:

Step 1: Inspect and Clean the Roof Surface

Before installing the flashing, inspect the roof surface for any debris, dirt, or damage that may interfere with the flashing installation. Clean the area where the flashing will be installed, ensuring a clean surface for proper adhesion of sealants and fasteners.

Step 2: Measure and Cut Flashing to Size

Using a tape measure, determine the length of flashing required for your roof. Measure the area where the flashing will be installed, and then cut the flashing to the appropriate length using metal snips. Be sure to wear safety gloves and glasses during this process to avoid injury from sharp edges.

Step 3: Apply Sealant

Apply a bead of sealant along the bottom edge of the flashing where it will contact the roof surface. This sealant will help create a watertight barrier between the flashing and the roof. Be sure to use a sealant that is compatible with both your flashing material and metal roof panels.

Step 4: Attach Flashing to the Roof

Align the flashing with the edge of the roof or the area where it is being installed. Secure the flashing in place using screws or fasteners specifically designed for metal roofs. Be sure to follow the manufacturer’s recommendations for fastener spacing and installation.

Step 5: Seal the Seams and Edges

Once the flashing is securely fastened, apply another bead of sealant along the top edge of the flashing where it meets the roof panel or adjoining flashing. This will create a watertight seal and prevent water from seeping underneath the flashing.


Installing flashing on a metal roof is a critical step in ensuring your roof remains watertight and protected from water damage. By following this expert-backed guide, you can confidently install flashing on your metal roof and enjoy the peace of mind that comes with a secure and professionally-installed roofing system.

Helpful FAQs on Installing Flashing on Metal Roofs

How often should flashing be replaced on a metal roof?

Flashing should be inspected regularly and replaced as needed. Generally, metal flashing can last as long as the metal roof itself, which can range from 30 to 50 years or more. However, flashing may need to be replaced sooner if it becomes damaged, corroded, or starts to leak.

Can I use different types of metal flashing with my metal roof?

It’s generally recommended to use a compatible metal flashing with your metal roof. Mismatched metals can cause galvanic corrosion, which can lead to premature failure of the flashing or roof panels. Consult the manufacturer’s guidelines for the best combination of materials.

What is the purpose of using sealant with flashing on a metal roof?

Sealant is used to create a watertight barrier between the flashing and the roof surface, preventing water infiltration. It’s essential to use a sealant that is compatible with your specific flashing and roof materials to ensure proper adhesion and longevity.

How can I prevent galvanic corrosion when using different types of metal flashing and roof materials?

To prevent galvanic corrosion, use a compatible metal flashing with your metal roof or use a barrier between the two different metals. A thin sheet of plastic or a specialized corrosion-resistant tape can be used as a barrier to isolate the metals and prevent corrosion.

Do I need a professional to install flashing on my metal roof?

While it’s possible to install flashing on your metal roof as a DIY project, hiring a professional is recommended, especially if you have limited experience with roofing projects. A professional roofer will have the expertise and tools to install the flashing correctly, ensuring a watertight seal and preventing potential damage to your home.

Leave a Reply

Your email address will not be published. Required fields are marked *'s "Best Roofers in Albuquerque" list for 4 years in a row

Call Us Now!